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I've noticed that some messages disappear from mail_message. The id is 90k higher than the count of all stored messages.

Is there any parameter that needs to be set that custom messages won't get deleted?

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Any chance somebody tried to import a lot of messages into your system? If somebody tried to import a big amount of messages and the import failed the ID's will still be incremented.

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No, mails started from scratch.

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OK I've figured it out... this happens when you copy template code from tutorials without checking what every parameter does.  I had 

<field name="auto_delete" eval="True"/>
in my template.
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Hi Samo: 

Did you by any chance uninstall an app/module ? If you uninstall an app/module, the corresponding messages get deleted.

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No I didn't uninstalled any modules. And that wouldn't be 1/8 off the records. ID at ~790k, number of messages ~700k.

Are the ids in the system sequential i.e. without gaps ?

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nope there are small gaps between. Is it possible that the mail_thread widget doesn't show all messages?

You can check at the database level. If there are gaps, maybe that explains the difference.

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I've looked in the DB. Does it delete the messages that failed to send?

As far as I know, I don't think it deletes messages. It may be using a pooling mechanism and caching a block of message ids. Unused message ids may be getting discarded at some time. This will need further digging into the code to ascertain the exact reason.

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